[PATCH 1/2] drm/amdgpu: use irq-safe lock for kiq->ring_lock

[Pixel Ding]

From: pding <Pixel.Ding at amd.com>

This lock is used during register accessing in SRIOV guest.
The register accessing could happen both in irq enabled and
irq disabled cases. Always use irq-safe lock.

Signed-off-by: pding <Pixel.Ding at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
index 9a73918..733c64c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -120,18 +120,19 @@ void amdgpu_virt_init_setting(struct amdgpu_device *adev)
 uint32_t amdgpu_virt_kiq_rreg(struct amdgpu_device *adev, uint32_t reg)
 {
 	signed long r;
+	unsigned long flags;
 	uint32_t val, seq;
 	struct amdgpu_kiq *kiq = &adev->gfx.kiq;
 	struct amdgpu_ring *ring = &kiq->ring;
 
 	BUG_ON(!ring->funcs->emit_rreg);
 
-	spin_lock(&kiq->ring_lock);
+	spin_lock_irqsave(&kiq->ring_lock, flags);
 	amdgpu_ring_alloc(ring, 32);
 	amdgpu_ring_emit_rreg(ring, reg);
 	amdgpu_fence_emit_polling(ring, &seq);
 	amdgpu_ring_commit(ring);
-	spin_unlock(&kiq->ring_lock);
+	spin_unlock_irqrestore(&kiq->ring_lock, flags);
 
 	r = amdgpu_fence_wait_polling(ring, seq, MAX_KIQ_REG_WAIT);
 	if (r < 1) {
@@ -146,18 +147,19 @@ uint32_t amdgpu_virt_kiq_rreg(struct amdgpu_device *adev, uint32_t reg)
 void amdgpu_virt_kiq_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v)
 {
 	signed long r;
+	unsigned long flags;
 	uint32_t seq;
 	struct amdgpu_kiq *kiq = &adev->gfx.kiq;
 	struct amdgpu_ring *ring = &kiq->ring;
 
 	BUG_ON(!ring->funcs->emit_wreg);
 
-	spin_lock(&kiq->ring_lock);
+	spin_lock_irqsave(&kiq->ring_lock, flags);
 	amdgpu_ring_alloc(ring, 32);
 	amdgpu_ring_emit_wreg(ring, reg, v);
 	amdgpu_fence_emit_polling(ring, &seq);
 	amdgpu_ring_commit(ring);
-	spin_unlock(&kiq->ring_lock);
+	spin_unlock_irqrestore(&kiq->ring_lock, flags);
 
 	r = amdgpu_fence_wait_polling(ring, seq, MAX_KIQ_REG_WAIT);
 	if (r < 1)
-- 
2.9.5